OPTISCHES AUFZEICHNUNGSMEDIUM.

摘要

A substrate (2) coated with a recording layer (3) comprising shape memory alloy films (311, 312) and hydrogen storage alloy film (32), a dielectric film (4) and light reflecting film (5) which are layered in the abovesaid order. The hydrogen storage alloy film (32) emits hydrogen gas and reduces in volume on receiving light for recording, whereby voids (321) are formed within said film. Shape memory alloy films (311, 312) are deformed by gas pressure in the voids (321) and thus the thickness of the voids (321) increases. When erasing light is applied, shape memory alloy films (311, 312) attempt to restore to the initial shape thereof to apply pressure to hydrogen gas in the voids (321) and said gas is again occluded, and the voids (321) almost disappear. Emission and storage of hydrogen gas are reversible to permit re-writing of recorded information.